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    SubjectRe: duration of udelay differs with activated realtime-preempt patch?
    On Fri, 2005-11-25 at 11:26 +0100, Schultheiss, Christoph wrote:
    > kernel: 2.6.14 with and without the realtime-preempt patch
    > hi list,
    > after measuring the duration of the function udelay (with oscilloscope
    > at parallel port), I figured out that udelay (5usec) with activated
    > realtime- preempt patch lasts a little bit longer. Without the patch the
    > time is exact.
    > All kernel debug switches are turned off at compile time.
    > Can anyone suggest why this happens?

    Well, the -rt patch, has changed the udelay function. BTW, you are
    using the constant udelay, right? Maybe an example of the code you used
    to test might be useful.

    Ingo or John?

    -- Steve

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